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'[OT] Unidentified 7 seg driver chip'
1998\03\11@093328 by n/a

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Hi

Just digging through my scrap box a while ago, I came across an IC
socketed next to a 7 seg LED display on an old bit of veroboard. The
markings are all faded badly.
I'm assuming it is some sort of BCD to 7 seg driver or something
similar.
The marking could be:
DM74S238 or something similar.

Any ideas??

Anton Coetzee
--
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           Anton Coetzee
      spam_OUTAnton.CoetzeeTakeThisOuTspamvip.co.za

      FibreFlight Composites

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1998\03\11@104658 by Keith Howell

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> an IC next to a 7 seg LED display on an old bit of veroboard.
> The markings are all faded badly.
> I'm assuming it is some sort of BCD to 7 seg driver or something
> similar.
> The marking could be:
> DM74S238 or something similar.
> Anton, I think it is a small fusible link PROM, in TTL family.

They were briefly used like PALs, before PALs etc took over.

I have seen them used where you need to hold a few bits of data,
such as Ethernet addresses, or need a very fast small ROM.

1998\03\11@120001 by m00c0600

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Undetermined origin c/o LISTSERV administrator wrote:
>
> Hi
>
> Just digging through my scrap box a while ago, I came across an IC
> socketed next to a 7 seg LED display on an old bit of veroboard. The
> markings are all faded badly.
> I'm assuming it is some sort of BCD to 7 seg driver or something
> similar.
> The marking could be:
> DM74S238 or something similar.
>
> Any ideas??
>
> Anton Coetzee.

DM 8880 is a 4-bit to seven segment decoder, a bit hard to get nowadays,
but very usefull 'cos it decodes HEX, (not just 0-9 and shows rubbish
if given a BCD input higher than 1010, like the 7447) and 'cos it has
high voltage open collector outputs, can directly drive gas plasma
displays, incandescent, or just about anythig 7-segment short of an LCD,
which was'nt around then. I think Farnell (in UK) still supply them, at
a silly price of about $10.

jim ford

1998\03\12@063556 by Caisson

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> Van: Undetermined origin c/o LISTSERV administrator
<.....owner-LISTSERVKILLspamspam@spam@MITVMA.MIT.EDU>
> Aan: PICLISTspamKILLspamMITVMA.MIT.EDU
> Onderwerp: [OT] Unidentified 7 seg driver chip
> Datum: woensdag 11 maart 1998 15:11
[Cut]
> The marking could be:
> DM74S238 or something similar.
>
> Any ideas??

Could be ... :-)

In my 'intergrated circuits handbook' (Philips, 1990) a 74x238 is a 3-to-8
line
decoder/demultiplexer. (TTL, 5 Volt.)

> Anton Coetzee

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